你好，Codeforces!
We are delighted to invite you to participate in Codeforces Round 1105 (Div. 1) or Codeforces Round 1105 (Div. 2), both of which will be held on Jun/27/2026 17:35 (Moscow time).
For both division 1 and division 2, you will be given $$$2.5$$$ hours to solve $$$6$$$ problems in each division.
The problems were authored and prepared by Gold14526, Milkcat2009 and wangmarui.
We would really like to thank the following people for making this round possible:
- Um_nik for the preliminary review of the round
- cadmiumky for the great coordination.
- Alexdat2000 for providing Russian translations.
- hcywoi and Network_Error who also prepared problems that were ultimately not used in this round.
- lkrqwq for optimizing many details of problems.
- StarSilk and errorgorn for black red testing.
- Network_Error, StelIawinD, _istil, jiazhichen844, ETO_leader, Dragos, MtSaka, Caylex, nifeshe, rolandpetrean for red testing.
- Proof_by_QED, lkrqwq, Watersphere, Timosh, tzl_Dedicatus545, 0x0002, a_little_cute, morandyg, abruce, programpiggy for yellow testing.
- MornStar, Ns6Juruo for purple testing.
- cybher, zhouyitao123, Nyemot, Pie_TealCompressorDragon for blue testing.
- xiaohaoaibiancheng666 for cyan testing.
- NSZBD_dklmq_12 for green testing.
- NanguX for gray testing.
- MikeMirzayanov and KAN for the great Codeforces and Polygon platforms.
- You for participating in this round.
Scoring Distribution:
| Division | A | B | C | D | E | F |
|---|---|---|---|---|---|---|
| Div. 2 | 500 | 1250 | 2000 | 2250 | 2750 | 3500 |
| Div. 1 | 750 | 1000 | 1500 | 2000 | 2750 | 3500 |
Good Luck & Have Fun!
UPD: Editorial has been posted
